China’s FAST telescope builds world’s largest neutral hydrogen galaxy sample

This milestone shifts the data frontier in radio astronomy, giving researchers a statistically powerful sample to test galaxy evolution models and the cosmic web's large-scale structure. It matters for astrophysics labs and data-driven cosmology, as the sheer sample size can sharpen constraints on gas dynamics and dark matter distribution. The open question is whether the survey's depth and sky coverage will enable cross-correlation with optical or X-ray catalogs, which could unlock new insights into galaxy formation.